Yes always check www.tripadvisor.com and type in the hotel name.
The reviews on Tripadvisor are decently positive for Maranton.
Have fun in Earls Court! That is where I stay when I go to London. Love the area.
Earls court road and High Street Kensington can keep me busy for most of a day just local near my hotel!
Also consider the Premier Inn, on Cromwell in Earls Court. Great reviews, and they just renovated everything.
Avoid Hotel Earls Court. I have heard horrific things about it and in my Easyhotel I actually heard people checking in at 1 am because they had to check out of Hotel Earls Ct because of bugs, filth and stench! Tripeadvisor reviews second that...